Insurance adjusters and defense lawyers often point to this allegation as evidence that an injured driver was careless, inattentive, or partly at fault for a crash. They use it to support comparative negligence arguments, especially in low-visibility collisions at dawn, dusk, in rain, or on rural two-lane roads where a vehicle may be harder to see. What it actually means is operating a motor vehicle without required illuminated headlamps during conditions when the law requires them.

In general use, the phrase covers driving after dark, before sunrise, or during weather or roadway conditions that reduce visibility below the legal standard. In Kentucky, the controlling rule is KRS 189.030. It requires headlights from one-half hour after sunset until one-half hour before sunrise, and at any other time when persons or vehicles are not clearly discernible at a distance of 500 feet. Kentucky also requires lighted headlamps whenever windshield wipers are in continuous use because of rain, sleet, or snow under KRS 189.050, as amended in 2005.

For an injury claim, the key issue is not just whether a citation was issued, but whether the missing headlights actually contributed to the collision. Under Kentucky's pure comparative fault system, KRS 411.182 (1988), a proven lighting violation can reduce damages by the injured person's percentage of fault rather than bar recovery entirely. That can matter in tourist traffic near bourbon distilleries, in Northern Kentucky commuter congestion, or around large haul-truck routes in eastern coal counties where visibility problems are common.